This is a restricted class for the art of metal deforming asdefined in this class definition.
For original placement of a patent in this class, its claimeddisclosure should meet the minimum requirements of the class definitionand should not exceed beyond the boundaries indicated in Scope ofthe Class and discussed in Lines With Other Classes.
Users of this class are urged to consult the above-noted sectionsas an aid in placing patents or in locating patented art involvingmetal deformation, whether in Class 72 or in related classes.
Criteria for Placement of Documents in this class containsuseful information for the searcher with regard to location of originalpatents, cross-references, and nonpatent literature in Class 72.
Terms followed by an asterisk (*) will be found tobe defined in the Glossary. Certain very frequently appearing terms,such as Work, Product, and Tool, are accompanied by the asteriskonly where the exact meaning of the term is deemed particularlyimportant.
The diagrams appearing in connection with certain definedterms in this class definition and certain subclass definitionsare intended as aids in distinguishing among separately classifiedconcepts, and are not to be considered as limitations on the structuralembodiments of the defined subject matter. The following reference charactershave uniform meanings where they appear in the diagrams.
C = Work-gripping clamp*
C-D = Closed die*
P = Product*
R = Ram or Roller* (as will be evident fromthe diagram)
T = Actuated tool* (may be a die)
T1, T2 = Tool couple* (at least one actuatedtool)
T1, T2, T3 = Tool complex* (at least twoactuated tools)
W = Work* or Blank*
(arrow) = Motion of work, tool, etc.
Class 72 is the residual locus for patents directed to a processor apparatus for the mechanical treatment of metal work (elementalmetal or mixture of metals) in a self-shape-sustaining state, tochange the shape or size of such work, without removal of materialtherefrom, (a) by the direct application of mechanical force orpressure to the work, or (b) by the application of energy to inducethe generation of mechanical stress within the work, which force,pressure, or stress produces a permanent change of shape in someportion of the work (i.e., exceeds the elastic limit of the work).
SCOPE OF THE CLASS
Class 72 is intended to be the locus for patents directed toa process or apparatus for the deformation of metal work by thedirect, or indirect, application of mechanical stress thereto whilethe work is in a self-sustaining state (i.e., not powdered or melted).
Since metal deformation is typically one of a number of differentiatedsteps in the manufacture of specific commercial products, the preponderanceof art discloses metal-deformation methods, or means in combination withother methods, or means of extraneous or nonclass type. It has,accordingly, been found necessary to admit some such combinationswhile otherwise maintaining Class 72 as a generally restricted class.The sole positive requirement for placement of a patent, as an original copy,in Class 72 is its claimed disclosure of a metal-deforming processor apparatus. A patent claiming metal deformation may, however,be excluded from the class because of claimed extraneous subjectmatter not expressly covered in the subclass titles and definitions. Claimedsubject matter which bars a patent from original placement in Class72 may be summarized as follows, in Lines With Other Classes andWithin This Class, below.